package com.gordon.tips.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.gordon.tips.domain.User;
import com.gordon.tips.log.Logger;
import com.gordon.tips.log.LoggerImpl;
import com.gordon.tips.service.impl.UserServiceImpl;

/**
 * Servlet Filter implementation class UserFilter
 */
public class UserFilter implements Filter {
	
	private static Logger logger = new LoggerImpl(UserFilter.class);

    /**
     * Default constructor. 
     */
    public UserFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		logger.debug("UserFilter is working.");
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse res = (HttpServletResponse) response;
		HttpSession session = req.getSession();
		
		//avoid filtering upload component
		String requestUrl = req.getServletPath();
		logger.debug(requestUrl);
		if(requestUrl.contains("uploadAction"))
		{
			logger.debug("upload can be accessed.");
			chain.doFilter(request, response);
			return;
		}
		
		User user=(User) session.getAttribute("user_session");
		
		if(user==null)
		{
			logger.info("Ilegal access.Denied.");
			session.setAttribute("accessDenied", "yes");
			res.sendRedirect("../login.jsp");
		}
			
		
		chain.doFilter(request, response);
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
